Field Weakening Active Indicator Light (Option); Turn Signal Indicator Light (From Series 7/95); Parking Brake Warning Light (From Series 12/94); Brake Shoe Warning Light (Option) - Linde E25 Service Training

Section 2.6
Page 76

2.6.10.1.1 FIELD WEAKENING ACTIVE INDICATOR LIGHT (OPTION)

With this option this lamp signals that the field weakening function is activated. The field weakening effect
is produced by connecting resistors in parallel to the field winding of the traction motors. This reduces the
magnetic flux in the field winding, while simultaneously increasing the speed of the motors. The field
weakening must be turned on and off depending on the load on the motors as the torque of the motors is
reduced with the increase in speed.

2.6.10.1.2 TURN SIGNAL INDICATOR LIGHT (FROM SERIES 7/95)

With the lighting option this lamp indicates that the turn signals are switched on. It is controlled directly over
the two 12 Volt terminals on the turn signal lights. A bidirectional optocoupler in the combined instrument
decouples the two signals from the turn signals lights. The connection is made with plug 5X13 under the LH
switch cover.

2.6.10.1.3 PARKING BRAKE WARNING LIGHT (FROM SERIES 12/94)

When the parking brake is applied, the parking brake switch 1S4 is opened. This cuts off the battery negative
signal applied to 6X9:23 and the lamp is illuminated.

2.6.10.1.4 BRAKE SHOE WARNING LIGHT (OPTION)

2.6.10.1.5 MOTOR BRUSH WARNING LIGHT

A brush wear switch is installed on each motor brush. When a brush is worn down to 60 % of its original length,
the respective brush switch is activated. The brush wear is signalled by the illumination of the lamp.
Information regarding which motor is affected is also shown on the LCD display (from series 7/95).
1 = RH traction motor
2 = LH traction motor
3 = Pump motor
The display of the motor number alternates every 5 seconds with the display of the elapsed service hours.
The fact that the brush wear limit of a motor has been reached is stored in the combined instrument with
the number of the motor in question and the elapsed service hours. This information can be read, if necessary,
with the diagnostic unit.

2.6.10.1.6 ENGINE TEMPERATURE WARNING LIGHT (FROM SERIES 7/95)

If the temperature of one of the three motors exceeds 140 °C, the lamp is illuminated to indicate overheating
of the motor in question. As in the case of the indication of the brush wear limit, the motor number is shown
in the LCD display and it is stored in the combined instrument together with the elapsed service hours.
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